Air filter



NOV. 28, 1933. BLACKMORE 1,936,659

AIR FILTER Filed Sept. 16, 1927 In/vento@ Patented Nov. 28, 1933 U STATES AIR FILTER Lloyd Blackmore, Highland Park, Mich., as-

signer to General Motors Corporation, Detroit, Bch., a corporation of Delaware Application September 16, 1927 Serial N0. 219,971

3 Claims.

rlhis invention relates to air filters and, particularly, to ilters which are adapted to be .used to clean the air supplie/dto the carhuretors of ernal combustion engines ci automotive Veiii/cles.

It is an object of this invention to provi-e a simple cloth lter through which the air current to the air intake must pass a :l which will cause "he particles or" dust to fall into a container which may be periodically removed emptied. It is a luher object oi invention to so construct ar ige the filter ,nat it will not become clogged v th oil thrown ed from the engine and will not be in a position to annoy the operator. It is a still further object of the invention to provide such a :Filter which will he capable oi ae stment for passing the incoming air past the enh? st pipe heating during cold weather or directly into the air intake during warm weather.

objects of invention will appear in course or" the following description, taken in c nnection with the accompanying drawing and appended claims.

In the drawing:

Figure l is a fragmentary view showing partly in section, and partly in side elevation, the front endof an automotive vehicle in which is em- `nodi-ed my invention.

`Figure 2 is an enlarged section taken on the line 2--2 of gne In Figure l of the drawing, I l-ave illustrated a portion of automotive vehicle in which is installed a conventional in combustion engine on wh there is provided a flexible tube 19 ch incoming air passes to the carn aziiold lll. In the rear of the engine compartiM is the dash le and to the dash 16 and to the body at 123 is the front wall 2G of the hlt-er casing. The casing may be considered as a substantially closed compartment having a front wall 20 and a rear wall i6, or as a rearwardly opening compartment having 'iront wall 20. The size oi the casing depends on the requirements of the engine and ordinarily covers only part oi the dash. Fixed within the casing between the wall 20 and the dash I6 is filter cloth 22, which is stretched across the casing and firmly fastened to the walls of the casing.

A pan or trough 2l is slidably mounted across the lower part of the casing, the trough being narrow enough so that space is provided for the entrance of air under the sloping floor board 24 of the car.

In Figure 2, I have illustrated the bypass arrangement. The numeral 26 indicates a casing through which the exhaust pipe 28 extends. Openings 30 and 32 are provided leading into the filter casing ahead of the filter cloth. The lower front part of the casing converges and has connected therewith the rear end of the flexible tube l0. A valve 34 is pivotally mounted in the converging portion and is adapted to close one side' or" the casing so that air may enter through the opening 30 past the exhaust pipe or through the opening 32. I have provided the pivot bolt of the valvewith a nut 36 so that the valve may be turned and fastened in any desired position.

In the operation of the device illustrated, air enters from below between the floor board 24 and trough 21 and passes through the cloth. Dust particles stopped by the cloth are shaken loose by the vibration and fall into the trough 21 which may be taken out occasionally and emptied. The large area of the cloth permits a slight vibration, and as the current Vthrough the cloth is not very rapid, due to the fact that its area is so much larger than a section of the air intake, this vibration is suflicient to shake the line dust particles loose and permit them to fall into the trough.

I claim:

l. In an automotive vehicle including an internal combustion engine and a dash, means for cleaning air and for conducting the cleaned air to the engine including a casing forward of the dash and opening toward the dash, a conduit extending irom the casing to the engine, a sheet of filtering material closing the opening in the casing and so mounted that it is adapted to eX during the operation of the cleaner so as to dislodge therefrom particles of foreign matter removed from the air thereby, and a removable receptacle between the sheet of nltering material and the dash in position to catch the foreign matter dislodged from the sheet.

2. In an automotive vehicle including an internal combustion engine and a dash, means for` cleaning air and for conducting the cleaned air to the engine, including a casing forward of the dash and opening toward the dash, a sheet of filtering material over the open side of the casing, a conduit extending from the engine and having two branches communicating with the casing, means to heat the air passing through one of said branches, and a valve adapted to close either of the branches to-communication with the engine.

3. In an air lter a casing, a substantially vertically disposed sheet of iilter cloth forming a partition within the casing, an opening in the lower wall of the casing on one side of the sheet of filtering material, and a member arranged to function as a closure for a portion of the opening and as a receptacle for collecting the dirt dislodged from the sheet of filtering material.

LLOYD BLACKMORE.

Cdl 

